Canola Watch – April 6, 2022

April 6, 2022
Soil temperatures of 5°C or higher with warmer weather in the forecast should facilitate reasonably good rates of emergence. See our whole playlist of canola production videos. Research blog: Management decisions to optimize soil temperature and moisture.

Canola Quiz – Biosecurity calculator

Our quiz this week is actually a questions-based calculator from Manitoba’s Pest Surveillance Initiative (PSI) Lab. After completing all questions (it takes about 15 minutes), participants will receive information about the biosecurity risk on a farm as well as information on how to address any risks. Try the calulator.

In This Issue

How to assess the right ‘go time’ for seeding

Early-seeded canola tends to yield more than later-seeded canola, but this is based on late April (south) or early May as the “early” treatment. Will seeding too early jeopardize a strong start? A rapid and evenly-emerging canola crop is more likely to outpace flea beetle pressure, will be more competitive against weeds and, with higher seed survival, provides a better return on investment for seed. Growers may need a higher seeding rate when seeding early. On the seed topic… For seed left over from last year, get a germination or vigour test to set an appropriate seeding rate. Low vigour seed may not be the best choice for early seeding. (How early is too early to seed canola?) (Spring frost risk maps) (Canola Digest: Get the most out of every seed)

Is the seeder ready to roll?

Give seeding tools a complete inspection and order parts now. Check for cracked hoses, worn packers, dull openers, air pressure issues, rough bearings… (Complete pre-season inspection list) (Podcast: Prep the drill for uniform seed depth) (Seeding canola in dry conditions)

So many reasons to soil test

Nutrient carryover *could* be higher than in previous years – especially if dry conditions reduced yields in 2021. Spring sampling is recommended if (1) samples were not taken in the fall, (2) crop regrowth or weeds in the fall may have taken up enough nutrients to change soil test results or (3) moisture from snow melt may have increased spring losses. Collect samples as soon as fields are dry enough for travel. Check with suppliers about orders and delivery, and whether growers can get what they need. (Canola Encyclopedia soil testing tips)

Seed-row fertilizer does more damage in dry soils

Canola damage from seed-placed fertilizer comes from the nitrogen component of ammonium phosphate, ammonium sulphate and all nitrogen fertilizers. Potassium fertilizers, which have a high salt index, can also damage seedlings. Damage can be worse in dry soils. The safest is to put no fertilizer in the seed row.  One exception is a starter rate of phosphorus (15-20 lb./ac. of P2O5 or ~30-40 lb./ac. of monoammonium phosphate), which can provide an establishment benefit for canola seedlings, especially in cool soils. Regarding lower rates to manage costs, consider the soil test result. If fields are testing medium for residual phosphorus, a fertilizer rate of 15-20 lb./ac. of P2O5 will give good economic response – even if it doesn’t make up for crop removal. If tests are low (below 10 ppm), growers should stick with recommended fertilizer rates. (Canola Encyclopedia on seed-placed fertilizer) (New podcast on nutrient maximization)

Scout Checklist


Herbicide carryover risk

  • Got new land? Do you know its herbicide history?
  • Risk factors

Soil Temperature

Soil Moisture

Soil Sampling

Check Bins

Community Connect

Canola Watch webinar – April 13 at noon CDT. Topic: “Make Every Plant Count: Practical Tips To Maximizing Your Plant Stand”. Information and registrationRecordings for all webinars in the series.

Keep It Clean Product Advisory webinar – April 19 at 11 a.m. CDT (10 a.m. CST/MDT). The webinar will review the crop protection products that may create market risk and to answer questions from growers and crop advisers. The list this year includes products for cereals and pulses. Information and registration

2022 Crop Protection Guides. Alberta: “Blue Book” Crop Protection Guide | Manitoba: Guide to Field Crop Protection | Saskatchewan: Guide to Crop Protection

Soil maps. Growers renting new land in 2022 may want to check on its soil characteristics. Provincial soil maps can provide details. Manitoba | Saskatchewan | Alberta | B.C.

A soybean map for canola farmers? Manitoba Agriculture posted a 2021 soybean cyst nematode distribution map. Similar to clubroot resting spores, encysted female nematodes can also be spread field-to-field in soil, either on equipment or through soil erosion. So there’s one more reason to practice effective sanitation.

Canola Watch podcastsKristjan Hebert, climate positive leader | Nutrient maximization – Canola Watch Webinar Series – Episode 5

Canola Watch exam for CCAs, CCSCs. Pass all five sections and earn seven CEUs.



Canola Watch is a free, unbiased, timely and research focused weekly newsletter from the Canola Council of Canada Crop Production Team

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